Sony TRV-720

My camcorder was working fine. For the first time ever, I used the mirror mode where you turn the LCD screen around so you can video yourself (I just wanted to see how it worked). Since then, when I power up the camera (it powers up fine) but as soon as I open the LCD door about 1/4 of the way, the entire camera shuts off. It won't turn on again until I close the LCD, but as soon as I start opening it again, it shuts down. When the LCD screen is closed, the viewfinder and camera work perfectly. Could there be something "shorting out" the camera because of the viewfinder being twisted once in mirror mode like I did? Is it worth repairing or should I count my losses?